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BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]
BUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline]
BUG: KASAN: slab-out-of-bounds in l2cap_sock_setsockopt+0x1a1f/0x1df0 net/bluetooth/l2cap_sock.c:996
Read of size 4 at addr ffff88810c7b35f3 by task syz.2.18/483

CPU: 1 PID: 483 Comm: syz.2.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0xf1/0x140 mm/kasan/report.c:444
 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report_generic.c:319
 copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]
 copy_from_sockptr include/linux/sockptr.h:55 [inline]
 l2cap_sock_setsockopt+0x1a1f/0x1df0 net/bluetooth/l2cap_sock.c:996
 __sys_setsockopt+0x2e9/0x470 net/socket.c:2203
 __do_sys_setsockopt net/socket.c:2214 [inline]
 __se_sys_setsockopt net/socket.c:2211 [inline]
 __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2211
 x64_sys_call+0x982/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:55
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4e5e338ef9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4e5e19d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f4e5e5a3fa0 RCX: 00007f4e5e338ef9
RDX: 0000000000000008 RSI: 0000000000000112 RDI: 0000000000000004
RBP: 00007f4e5e3cdee0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000200000000040 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4e5e5a4038 R14: 00007f4e5e5a3fa0 R15: 00007ffd5afcbfc8
 </TASK>

Allocated by task 483:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 ____kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 __kmalloc+0x13d/0x2c0 mm/slub.c:4436
 kmalloc include/linux/slab.h:624 [inline]
 __cgroup_bpf_run_filter_setsockopt+0x8e7/0xaa0 kernel/bpf/cgroup.c:1511
 __sys_setsockopt+0x40e/0x470 net/socket.c:2186
 __do_sys_setsockopt net/socket.c:2214 [inline]
 __se_sys_setsockopt net/socket.c:2211 [inline]
 __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2211
 x64_sys_call+0x982/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:55
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff88810c7b35f0
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 3 bytes inside of
 8-byte region [ffff88810c7b35f0, ffff88810c7b35f8)
The buggy address belongs to the page:
page:ffffea000431ecc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10c7b3
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 0000000100000001 ffff888100042300
raw: 0000000000000000 0000000080660066 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 3842696357, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x2d3a/0x2dc0 mm/page_alloc.c:4485
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5808
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa1/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x381/0x810 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954
 kstrdup mm/util.c:64 [inline]
 kstrdup_const+0x55/0x90 mm/util.c:87
 __kernfs_new_node+0xa8/0x6b0 fs/kernfs/dir.c:589
 kernfs_new_node+0x150/0x260 fs/kernfs/dir.c:669
 kernfs_create_dir_ns+0x47/0x130 fs/kernfs/dir.c:1017
 sysfs_create_dir_ns+0x128/0x290 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal+0x6d0/0xcb0 lib/kobject.c:263
 kobject_add_varg lib/kobject.c:398 [inline]
 kobject_init_and_add+0x128/0x190 lib/kobject.c:481
 ext4_register_sysfs+0xbb/0x2c0 fs/ext4/sysfs.c:529
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810c7b3480: fc 00 fc fc fc fc 06 fc fc fc fc 04 fc fc fc fc
 ffff88810c7b3500: 00 fc fc fc fc fb fc fc fc fc fa fc fc fc fc fa
>ffff88810c7b3580: fc fc fc fc 05 fc fc fc fc 00 fc fc fc fc 01 fc
                                                             ^
 ffff88810c7b3600: fc fc fc 00 fc fc fc fc fa fc fc fc fc fa fc fc
 ffff88810c7b3680: fc fc fa fc fc fc fc 00 fc fc fc fc 05 fc fc fc
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